LCD-Related Symptoms

Important

The TFT LCD for the notebook computer contains

over 921,000 thin-film transistors (TFTs). A small

number of missing, discolored, or lighted dots (on all

the time) is characteristic of TFT LCD technology, but

excessive pixel problems can cause viewing concerns.

The LCD should be replaced if the number of missing,

discolored, or lighted dots in any background is 21 or

more.

Symptom / Error FRU / Action in Sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
1. Reseat the CPU Card
2. DC/DC card
3. System board
1. LCD backlight not
working.
2. LCD too dark.
3. LCD brightness cannot
be adjusted.
4. LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD assembly
3. System board
1. The LCD screen is
unreadable.
2. Some pels missing in
characters.
3. The screen is
abnormal.
4. Wrong color displayed.
1. See important note
for “LCD-Related
Symptoms.”
2. Reseat all LCD
connectors.
3. LCD assembly
4. System board
LCD has extra horizontal or
vertical lines displayed. LCD assembly
Peripheral-Device-Related Symptoms
Symptom / Error FRU / Action in Sequence
The external monitor does
not work correctly. Connect the external
monitor to another PC. If
the monitor works fine,
replace the system board.
If not, replace the external
monitor.
Printer problems. 1. Run printer self-test.
2. Parallel port wrap test.
3. System board
4. Printer cable
(See the printer manual for
the above tests.)
46 IBM ThinkPad 380XD, 385XD